package day3.demo5_pro;

import java.util.Properties;

public class Test {
    public static void main(String[] args) {
        Properties p = new Properties();
//        p.put("a1",139);
        p.setProperty("a1","139");
        p.setProperty("a2","1888");
        p.setProperty("a1","hello");
        System.out.println(p.getProperty("a1"));
    }
}
